161211378 has 16 divisors (see below), whose sum is σ = 323239680. Its totient is φ = 53600976.

The previous prime is 161211361. The next prime is 161211397. The reversal of 161211378 is 873112161.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31458 + ... + 36221.

It is an arithmetic number, because the mean of its divisors is an integer number (20202480).

Almost surely, 2^161211378 is an apocalyptic number.

161211378 is an abundant number, since it is smaller than the sum of its proper divisors (162028302).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161211378 is a wasteful number, since it uses less digits than its factorization.

161211378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68081.

The product of its digits is 2016, while the sum is 30.

The square root of 161211378 is about 12696.9042683640. The cubic root of 161211378 is about 544.2501575293.

The spelling of 161211378 in words is "one hundred sixty-one million, two hundred eleven thousand, three hundred seventy-eight".